Method and device for transmitting, by terminal, uplink control information in communication system

ABSTRACT

Disclosed is a 5G or pre-5G communication system for supporting a data transmission rate higher than that of a 4G communication system such as LTE. According to the present disclosure, a method of a terminal in a wireless communication system comprises the steps of: receiving downlink control information (DCI); confirming whether the DCI is uplink DCI for an uplink or downlink DCI for a downlink; and transmitting, through an uplink control channel or an uplink data channel, uplink control information (UCI) according to the confirmation result.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of prior application Ser.No. 16/081,296, filed on Aug. 30, 2018, which was a U.S. National Stageapplication under 35 U.S.C. § 371 of an International application numberPCT/KR2017/002287, filed Mar. 2, 2017, and was based on and claimedpriority under 35 U.S.C § 119(e) of a U.S. Provisional application62/302,373, filed on Mar. 2, 2016, and a U.S. Provisional application62/312,812, filed on Mar. 24, 2016, in the U.S. Patent and TrademarkOffice, the disclosure of each of which is incorporated by referenceherein in its entirety.

TECHNICAL FIELD

Various embodiments of the present disclosure relate to a communicationsystem, and more particularly, to, a method and apparatus fortransmitting, by a terminal, uplink control information in acommunication system.

BACKGROUND ART

To meet the demand for wireless data traffic having increased sincedeployment of 4G communication systems, efforts have been made todevelop an improved 5G or pre-5G communication system. Therefore, the 5Gor pre-5G communication system is also called a ‘Beyond 4G Network’ or a‘Post LTE System’.

The 5G communication system is considered to be implemented in higherfrequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higherdata rates. To decrease propagation loss of the radio waves and increasethe transmission distance, the beamforming, massive multiple-inputmultiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna,an analog beam forming, large scale antenna techniques are discussed in5G communication systems.

In addition, in 5G communication systems, development for system networkimprovement is under way based on advanced small cells, cloud RadioAccess Networks (RANs), ultra-dense networks, device-to-device (D2D)communication, wireless backhaul, moving network, cooperativecommunication, Coordinated Multi-Points (CoMP), reception-endinterference cancellation and the like.

In the 5G system, Hybrid FSK and QAM Modulation (FQAM) and slidingwindow superposition coding (SWSC) as an advanced coding modulation(ACM), and filter bank multi carrier (FBMC), non-orthogonal multipleaccess (NOMA), and sparse code multiple access (SCMA) as an advancedaccess technology have been developed.

Conventionally, in the LTE, the control information that a terminaltransmits on an uplink may include at least one of hybrid automaticrepeat request (HARQ) ACK/NACK, channel quality (CQI) information,precoding matrix indication (PMI) Information, rank indication (RI)information, and scheduling request SR information The controlinformation may be transmitted on a physical uplink control channel(PUCCH) which is an uplink control channel, or may be transmitted on aphysical uplink shared channel (PUSCH), which is an uplink data channel,along with data.

In the related art, downlink control information that a terminalreceives from a base station and uplink control information transmittedfrom the terminal to the base station are transmitted at differenttransmission time intervals (TTI). For example, the base stationtransmits the downlink control information to the terminal at an n-thsubframe, and the terminal transmits the uplink control information tothe base station at a (n+4)-th subframe. For example, the terminal cantransmit ACK/NACK information for reception of the downlink controlinformation to the base station in the (n+4)-th subframe.

Also, when the base station receives the NACK in the (n+4)-th subframe,the base station can retransmit data in the (n+K)-th subframe. In thiscase, a K value is fixed to 8 in the case of a frequency divisionduplexing (FDD) system and may be changed according to a configurationof a downlink/uplink subframe (DL/UL subframe) in the case of a timedivision duplexing (TDD) system, but the K value is fixed in a specificconfiguration.

Such an operation may not satisfy a low communication latency which isone of the requirements of the 5G communication system, and the degreeof freedom of a base station scheduler may be limited to reduceflexibility of a base station scheduler.

A self-contained frame structure has been proposed to satisfy theserequirements. The sub-frame structure may be used in combination withthe term self-contained frame structure, and may mean a frame structurefor fast HARQ-ACK (fast HARQ-ACK) support or a frame structure for lowdelay support. In the frame structure, the configuration of the subframecan be changed dynamically for each subframe. For example, the n-thsubframe may be set as downlink data reception, a (n+1)-th subframe maybe set as uplink data transmission, a (n+2)-th subframe receivesdownlink data, and a (n+3)-th subframe may be set as control informationtransmission. Therefore, it is necessary to design the operation of theterminal and the control channel for transmitting the controlinformation on the uplink in such a frame structure.

In addition, the 5G communication system is considering the use of asuper high frequency (mmWave) band (for example, 30 GHz, 60 GHz bands)which may have a wide bandwidth in order to achieve a high datatransmission rate. However, in the super high frequency band, the use oftechnologies such as beamforming has been discussed because apropagation path loss and a propagation transmission distance are short.Therefore, for the beam operation through the beamforming, a method forconfiguring control information is needed.

DISCLOSURE OF INVENTION Technical Problem

An object of the present disclosure is directed to provision of a methodfor configuring control information that a terminal transmits on anuplink and a method for operating a terminal to transmit controlinformation.

Another object of the present disclosure is directed to provision of amethod for configuring control information for a beam operation when atechnology such as beamforming is applied and a method for operating aterminal for transmitting control information.

Solution to Problem

Various embodiments of the present disclosure are directed to theprovision of a method of a terminal in a wireless communication systemincludes: receiving downlink control information (DCI); identifyingwhether the DCI is an uplink DCI for an uplink or a downlink DCI for adownlink; and transmitting, on an uplink control channel or an uplinkdata channel, uplink control information (UCI) according to theidentification result.

Various embodiments of the present disclosure are directed to theprovision of a method of a base station includes: generating downlinkcontrol information (DCI); transmitting the DCI to a terminal; andreceiving uplink control information (UCI) on an uplink control channelor an uplink data channel according to whether the DCI is an uplink DCIfor an uplink or a downlink DCI for a downlink.

Various embodiments of the present disclosure are directed to theprovision of a terminal includes: a transceiver configured to transmitand receive a signal; and a controller configured to receive downlinkcontrol information (DCI), identify whether the DCI is an uplink DCI foran uplink or a downlink DCI for a downlink; and transmit, on an uplinkcontrol channel or an uplink data channel, uplink control information(UCI) according to the identification result.

Various embodiments of the present disclosure are directed to theprovision of a base station includes a transceiver configured totransmit and receive a signal; and

A controller configured to generate downlink control information (DCI),transmit the DCI to a terminal; and receive uplink control information(UCI) on an uplink control channel or an uplink data channel accordingto whether the DCI is an uplink DCI for an uplink or a downlink DCI fora downlink.

Advantageous Effects of Invention

According to the embodiment of the present disclosure, the delay timecan be reduced when the terminal transmits the uplink controlinformation, and the flexibility of the base station scheduler can beincreased.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a frame structure for transmittingdownlink data according to the present disclosure.

FIG. 2 is a diagram illustrating a frame structure for transmittinguplink data according to the present disclosure.

FIG. 3 is a diagram illustrating an uplink control channel fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 4 is a diagram illustrating an operation of a base station fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 5 is a diagram illustrating another operation of a base station fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 6 is a diagram illustrating another operation of a base station fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 7 is a diagram illustrating an operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 8 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 9 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 10 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 11 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

FIG. 12 is a diagram illustrating an operation of a terminal for a CSImeasurement report according to an embodiment of the present disclosure.

FIG. 13 is a diagram illustrating another operation of a terminal for aCSI measurement report according to an embodiment of the presentdisclosure.

FIG. 14 is a diagram illustrating a structure of the terminal accordingto an embodiment of the present disclosure; and

FIG. 15 is a diagram illustrating a structure of the base stationaccording to an embodiment of the present disclosure.

MODE FOR THE INVENTION

Hereinafter, embodiments of the present disclosure will be described indetail with reference to the accompanying drawings.

In describing the embodiments of the present disclosure, a descriptionof technical contents which are well known to the art to which thepresent disclosure belongs and are not directly connected with thepresent disclosure will be omitted. This is to more clearly transfer agist of the present disclosure by omitting an unnecessary description.

For the same reason, some components are exaggerated, omitted, orschematically illustrated in the accompanying drawings. Further, thesize of each component does not exactly reflect its real size. In eachdrawing, the same or corresponding components are denoted by the samereference numerals.

Various advantages and features of the present disclosure and methodsaccomplishing the same will become apparent from the following detaileddescription of embodiments with reference to the accompanying drawings.However, the present disclosure is not limited to the embodimentsdisclosed herein but will be implemented in various forms. Theembodiments have made disclosure of the present disclosure complete andare provided so that those skilled in the art can easily understand thescope of the present disclosure. Therefore, the present disclosure willbe defined by the scope of the appended claims. Like reference numeralsthroughout the description denote like elements.

In this case, it may be understood that each block of processing flowcharts and combinations of the flow charts may be performed by computerprogram instructions. Since these computer program instructions may bemounted in processors for a general computer, a special computer, orother programmable data processing apparatuses, these instructionsexecuted by the processors for the computer or the other programmabledata processing apparatuses create means performing functions describedin block(s) of the flow charts. Since these computer programinstructions may also be stored in a computer usable or computerreadable memory of a computer or other programmable data processingapparatuses in order to implement the functions in a specific scheme,the computer program instructions stored in the computer usable orcomputer readable memory may also produce manufacturing articlesincluding instruction means performing the functions described inblock(s) of the flow charts. Since the computer program instructions mayalso be mounted on the computer or the other programmable dataprocessing apparatuses, the instructions performing a series ofoperation steps on the computer or the other programmable dataprocessing apparatuses to create processes executed by the computer tothereby execute the computer or the other programmable data processingapparatuses may also provide steps for performing the functionsdescribed in block(s) of the flow charts.

In addition, each block may indicate some of modules, segments, or codesincluding one or more executable instructions for executing a specificlogical function (s). Further, it is to be noted that functionsmentioned in the blocks occur regardless of a sequence in somealternative embodiments. For example, two blocks that are consecutivelyillustrated may be simultaneously performed in fact or be performed in areverse sequence depending on corresponding functions sometimes.

Here, the term ‘-unit’ used in the present embodiment means software orhardware components such as FPGA and ASIC and the ‘˜unit’ performs anyroles. However, the meaning of the ‘˜unit’ is not limited to software orhardware. The ‘˜unit’ may be configured to be in a storage medium thatmay be addressed and may also be configured to reproduce one or moreprocessor. Accordingly, for example, the ‘˜unit’ includes componentssuch as software components, object oriented software components, classcomponents, and task components and processors, functions, attributes,procedures, subroutines, segments of program code, drivers, firmware,microcode, circuit, data, database, data structures, tables, arrays, andvariables. The functions provided in the components and the ‘˜units’ maybe combined with a smaller number of components and the ‘˜units’ or maybe further separated into additional components and ‘˜units’. Inaddition, the components and the ‘˜units’ may also be implemented toreproduce one or more CPUs within a device or a security multimediacard.

Further, in the drawings illustrating a method in embodiments, the orderof description does not necessarily correspond to the order ofexecution, and the order relationship may be changed or executed inparallel.

In addition, the present disclosure describes, by way of example, a caseof a wireless communication system for convenience of explanation, butthe content of the present disclosure may also be applied to a wiredcommunication system

The present disclosure includes a method for configuring controlinformation transmitted from a terminal on an uplink in a 5Gcommunication system. Further, a method and a device for operating aterminal for transmitting control information on an uplink.

More specifically, in the present disclosure, the uplink controlinformation may include at least one of the following information.

-   -   HARQ-ACK/NACK: ACK/NACK feedback information on downlink data        information transmitted from the base station to the terminal    -   CQI: Feedback information on downlink channel quality        information measured by the terminal    -   PMI: Feedback information on downlink precoding matrix        information measured by the terminal    -   RI: Feedback information on downlink rank information measured        by the terminal    -   Beam Measurement Information: It may include a beam index (BI)        of the downlink beam measured by the terminal and downlink beam        quality information (BQI) measured by the terminal.

The base station may periodically transmit a beam measurement referencesignal (BRS) to acquire the beam information (BI, BQI) from theterminal.

The terminal may measure BRS transmitted from the base station and feedback the BQI to the base station, along with the BI of the beam havingthe best quality. At this point, the BQI is measured using the BRS, andmay be defined as received signal strength of a desired beam (BRSRP),and a ratio of received signal strength of a desired beam and receivedsignal strength of an interference beam, etc.

The information measured using the BRS may be referred to as beam statusinformation (BSI).

Meanwhile, the terminal may measure the BRSs transmitted from the basestation and then align the BRSs in order of magnitude, and feedback NBIs and BQIs corresponding to each BI according to an instruction of thebase station (for example, N=1, 2, . . . ).

The information on N can be referred to as feedback number information,and can be applied to all terminals of cells that the base stationserves based on the system information.

As another example of signaling of the feedback number information(information on N), the base station may notify the terminal of theinformation on the N based on UE-specific RRC signaling or the downlinkcontrol information (DCI) which is transmitted through a downlinkcontrol channel. In this case, the downlink control information mayinclude the DCI (hereinafter, referred to as UL DCI) for the uplink andthe DCI (hereinafter, referred to as a DL DCI) for the downlink, and theinformation on the N may be included in the DCI.

As described above, the base station may notify the terminal of theinformation on the N, and the base station may fed back with differentnumbers of beam information for each terminal. For example, a terminal Amay be set as N=1 from the base station, and the terminal A can feedback the best one beam (the beam having the largest received signalstrength of the beam) to the base station. In addition, a terminal B maybe set as N=2 from the base station, and the terminal B may feedback thetwo best beams to the base station

Meanwhile, if the number of beams to be operated by the base station istoo large, the terminal may take a long time to acquire the beaminformation. In this case, the base station may operate a referencesignal for additional beam measurement. For example, when the number ofbeams to be operated by the base station is 200, the base stationperiodically transmits (for example, 100) BRSs capable of representingsome of 200 beams to enable the terminal to coarsely acquire the beaminformation (coarse beam acquisition) and transmits an additional beamrefinement reference signal (BRRS) to enable the terminal to accuratelyacquire the beam information (fine beam acquisition). That is, theterminal may acquire the best beam information in one-shot using onlythe BRS or acquire the best beam information by a two-step method of theBRS and the BRRS.

The uplink control information (UCI) may be transmitted on a separateuplink control channel (xPhysical uplink control channel (xPUCCH)) ormay be transmitted on an uplink data channel (xPhysical uplink sharedchannel (xPUSCH)), along with data. The xPUCCH and the xPUSCH of thepresent disclosure refer to an uplink control channel and an uplink datachannel of an arbitrary generation, and may be used in combination asfollows.

It may be defined whether the terminal feeds back the UCI on the xPUCCHor the xPUSCH according to the instruction (or indication) of the basestation. Hereinafter, a method for indicating whether a terminal feedsback UCI to an xPUCCH or an xPUSCH will be described.

For example, the base station may explicitly indicate based on the DCIwhether the terminal transmits the UCI on the xPUCCH or the xPUSCH. Forexample, it may be indicated to transmit the UCI on the xPUCCH if 1-bitis ‘0’, and transmit the UCI on xPUSCH if the 1-bit is ‘1’.

As another example, the base station may implicitly indicate based onthe DCI whether the terminal transmits the UCI on the xPUCCH or thexPUSCH. That is, if the terminal receives an uplink grant (UL grant) forthe xPUSCH through the UL DCI in an ‘n-k’-th downlink subframe (DLsubframe) based on a time (for example, ‘n’-th subframe) to report theUCI (k>0), the terminal transmits the UCI on the xPUSCH. Otherwise, (forexample, if the grant for the xPUCCH is received via the DL DCI in the‘n-k’-th DL subframe based on the ‘n’-th subframe), the terminaltransmits the UCI on the xPUCCH.

Describing specifically, when the base station desires to set theterminal to report the UCI through the xPUCCH in the n subframe which isthe reporting time, the base station can transmit the DL DCI to theterminal in the n-k-th downlink subframe. In this case, the DL DCI mayinclude a field for triggering the UCI reporting, and the field mayconsist of 3 bits, for example.

Therefore, the terminal receiving the DL DCI in the n-k-th downlinksubframe may identify that the n-th subframe is the subframe allocatedwith the xPUCCH, and may report the UCI through the xPUCCH in thesubframe. At this time, the terminal can identify the k value based onthe information included in the received DL DCI.

When the base station intends to set to report the UCI through thexPUCCH in the n subframe which is the reporting time of the terminal,the base station can transmit the UL DCI to the terminal in the n-k-thdownlink subframe. In this case, the UL DCI may include a field fortriggering the UCI reporting, and the field may consist of 3 bits, forexample. Therefore, the terminal may report the UCI through the xPUSCHusing the resource allocation information included in the UL DCI.

On the other hand, the information for triggering the UCI report may beincluded in the DCI received in the (n-k)-th downlink subframe or may beincluded in a separate DCI. The detailed content thereof will bedescribed below.

In this manner, when the terminal receives the DCI, the terminal maydecode the DCI and then determine whether the corresponding DCI is theDL DCI or the UL DCI, and transmit the uplink control informationthrough the xPUSCH or the xPUCCH at the reporting time according to thedetermination result.

At this time, the terminal may identify the DL DCI or the UL DCI basedon a DCI format promised between the base station and the terminal or aspecific field within the DCI.

For example, if the DCI is identified in the DCI format, the basestation and the terminal need to be promised in advance that A bits arethe DC DCI (DCI Format A) and B bits are the UL DCI (DCI Format B).

Otherwise, if the DCI is identified based on a specific field in theDCI, y bits constituting a most significant bit (MSB) of a DCI Fieldconsisting of x bits and y bits constituting a least significant bit(LSB) of the DCI Field may indicate the DL DCI or the UL DCI. The sizeof y in the y bits described above may be different depending on thetype of DCI supported by the system. For example, if a particular systemsupports four types of DCIs, then y=2, if it is ‘00’, then it may meanUL DCI for single layer transmission of the xPUSCH, and if it is ‘01’,it may mean UL DCI for multi-layer transmission of the xPUSCH. Inaddition, if it is ‘10’, it may also mean DL DCI for single layertransmission of the xPDSCH and if it is ‘10’, it may mean DL DCI formulti-layer transmission of the xPDSCH.

In the above example, the MSB or the LSB of a specific Field in the DCIreceived by the terminal consists of ‘00’ or ‘01’ (UL DCI), and if theterminal has UCI information to be transmitted to the base station, theterminal transmits the UCI through the xPUSCH. In addition, the MSB orthe LSB in the DCI Field received by the terminal consists of ‘00’ or‘01’ (DL DCI), and if the terminal has UCI information to be transmittedto the base station, the terminal transmits the UCI through the xPUCCH.

Meanwhile, when the base station indicates the terminal to transmit theUCI through the xPUSCH of the n-th subframe, the base station mayadditionally indicate whether the UCI should be multiplexed with data tobe transmitted on the xPUSCH or only the UCI should be transmitted onthe xPUSCH without data. At this time, the base station can determinewhether to multiplex data with the UCI based on the 1-bit indication ofthe DCI. The 1-bit indication may be referred to as a multiplexing ornon-multiplexing indication.

For example, the terminal receives the DCI from the base station. Theterminal receiving the DCI demodulates and decodes the DCI, anddetermines whether it is the UL DCI or the DL DCI based on the DCIformat or a specific Field in the DCI. The terminal determining that itis the UL DCI determines whether or not information related to the UCItransmission (hereinafter, referred to as UCI transmission information)is included in the corresponding DCI.

In this case, the UCI transmission information may include atime/frequency resource of an uplink data channel (xPUSCH) fortransmitting the UCI. At this time, the time resource information of thexPUSCH may be a symbol index (Index) (or the number of symbols), a slotindex, or a subframe index of the xPUSCH on which the UCI is to betransmitted. On the other hand, the frequency resource information ofthe xPUSCH may include a location of a resource block (RB) and thenumber of RBs of the xPUSCH on which the UCI is to be transmitted.

If the DCI field includes the UCI transmission information, the terminaldetermines whether there is a 1-bit indication field indicating whetherto transmit only UCI information without transmitting data or tomultiplex the UCI with the data information. If the terminal isindicated to transmit only the UCI information without transmitting datato the DCI Field, the terminal transmits only the UCI information on thexPUSCH.

For example, when the 1-bit information is 1, it is indicated totransmit only the UCI information without transmitting data, and when itis 0, if it is assumed that it is indicated that data and the UCIinformation are multiplexed and transmitted, in the case in which the1-bit indication is set to be 1, the terminal can transmit only the UCIinformation.

On the other hand, when the 1-bit information of the DCI field is set tobe 0, the terminal multiplexes the UCI with data and transmits themultiplexed UCI and data on the xPUSCH. When the UCI is transmitted bybeing multiplexed with data, frequency resource information fortransmitting the UCI in the UCI transmission information may be omitted.This is because the frequency resource information for the datatransmission is the same as the frequency resource information for theUCI transmission.

The base station may determine whether the base station indicates theterminal to transmit the UCI on the xPUCCH or the xPUSCH by usingvarious methods.

For example, when the base station determines that the uplink channelstate of the terminal is bad and thus the coverage for the uplinkcontrol information transmission is insufficient, the base stationtransmits the indication, which allows the terminal to transmit the UCIon the xPUSCH, through the DCI.

As another example, when the amount of UCI to be fed back by theterminal is equal to or greater than the specific number of bits (forexample, [x] bits) (for example, when a size of bits of the UCI isdefined as A, in the case of A>[x] bits), the base station may issue anindication to transmit the UCI on the xPUSCH. At this time, the specificnumber of bits can be referred to as a threshold bit value.

As another example, when the amount of UCI to be fed back by theterminal is equal to or greater than a first specific bit (for example,[X] bits) (A≥[x] bits), the base station may increase the number ofsymbols of the xPUCCH for transmitting the UCI.

In this case, the base station can use the feedback count informationset in the terminal in order to identify the amount of UCI to be fedback by the terminal.

For example, if the amount of UCI is smaller than or equal to [x] bits(A≤[x] bits), as the number of symbols of the xPUCCH for transmittingthe UCI, one symbol may be used. In the assumption, if the amount of UCIis greater than [x] bits (A>[x] bits), the base station increases thenumber of symbols of the xPUCCH for transmitting UCI to two. The basestation may notify, through the DCI, whether the number of symbols ofthe xPUCCH is one or two.

Meanwhile, if the amount of UCI is greater than a second specific bit(for example, [y] bits) (A>[y] bits, in this case, y>x), the basestation may indicate the terminal to transmit the UCI on the xPUSCH. Inthis case, the first specific bit may be referred to as a firstthreshold bit value, and the second specific bit may be referred to as asecond threshold bit value. The present example describes that thenumber of symbols of the xPUCCH is one or two, but the number of symbolsis not limited thereto.

Thus, the threshold value can be additionally set, and the base stationcan increase the number of symbols of the xPUCCH each time exceedingeach threshold value.

In addition, the base station can transmit information on theabove-described threshold value to the terminal. At this time, the basestation may include the information on the threshold value in the DCItransmitted to the terminal, and may transmit the information on thethreshold value through the system information or the RRC signaling. Inaddition, if the number of UCI bits exceeds the threshold value, thebase station may transmit information for configuring the UCI to betransmitted on the xPUSCH or information for configuring the UCI toincrease the number of symbols to the terminal through DCI, systeminformation or RRC signaling.

Meanwhile, based on the information that the base station has indicatedby the DCI, the terminal may determine whether to transmit theinformation to be fed back by the terminal on the xPUCCH or the xPUSCH.

As described above, the base station can explicitly indicate whether totransmit the UCI on the xPUCCH or the xPUSCH using the 1-bitinformation, and the terminal can determine whether to transmit the UCIinformation on the xPUCCH or the xPUSCH.

In another example, the base station may implicitly indicate whether totransmit the UCI on the xPUCCH or the xPUSCH.

Accordingly, after receiving and decoding the DCI, the terminal candetermine whether the corresponding DCI is the DL DCI or the UL DCI. Asdescribed above, the terminal can identify whether it is the DL DCI orthe UL DCI through the DCI format promised to the base station and theterminal or the specific field in the DCI. The details are the same asthose described above.

If the DCI is the DL DCI is used, the terminal can transmit the UCIthrough the xPUCCH at the reporting time. If the DCI is the UL DCI, theterminal can transmit the UCI through the xPUSCH at the reporting time.

In addition, the terminal can determine whether to transmit the UCI onthe xPUCCH or the xPUSCH based on the amount of UCI information to befed back by the terminal.

For example, the terminal recognizes that the UCI should be transmittedon the xPUSCH when the amount of UCI information is greater than [x]bits ([x] bits) (A>[x] bits) If the information on the specific numberof bits and the amount of UCI are greater than the specific number ofbits, the terminal can receive through the DCI the informationindicating that the UCI is transmitted on the xPUSCH.

When the reporting time is the n-th subframe, if the DCI received in then-k-th subframe fails to detect the resource allocation information forthe xPUSCH (i.e., the base station transmits an UL grant for the xPUSCH,but the terminal does not receive the UL grant), the terminal requeststhe resource allocation for the xPUSCH to the base station.

As another example, when the amount of UCI information to be fed back bythe terminal is greater than the specific number of bits ([x] bits) butthe UCI is not fed back on the xPUSCH because the grant for the xPUSCHis not received, only the terminal securing the grant for the xPUCCHmakes the UCI information into the specific number of bits depending onthe defined rule and transmits the UCI information on the xPUCCH.

In this case, the rule on which information is not transmitted needs tobe defined in advance based on the appointment between the base stationand the terminal and the [x] bits may be made in order of theHARQ-ACK/NACK, the Beam related information (BI, BQI), and the CQI/PMI,and the RI to be transmitted on the xPUCCH.

Alternatively, the base station may notify the terminal of the rulethrough the system information or the RRC signaling. Therefore, theterminal can generate the UCI in the defined order, and if the generatedUCI exceeds the specific number of bits, the terminal may not includethe posterior rank information.

Hereinafter, the operation of the terminal for the UCI transmission willbe described when a specific terminal is allocated with the xPUCCH andthe xPUSCH in the same subframe.

-   -   Option 1) The terminal transmits the UCI through one of the        xPUCCH and the xPUSCH in the same subframe    -   Option 1-1) When only the xPUSCH is transmitted: At this time,        the number of symbols used for the xPUSCH transmission is larger        than the number of symbols used for the xPUCCH, and therefore        the operation of the terminal may be defined to transmit the UCI        on the xPUSCH (that is, multiplexing of data and the UCI) to        secure the coverage and not to use the xPUCCH.    -   Option 1-2) When the UCI is transmitted only on the xPUCCH:        Priority is allocated to the specific UCI (for example,        HARQ-ACK/NACK) transmission, thus the corresponding UCI is        transmitted on xPUCCH and the remaining UCI is not transmitted        in the same subframe. For this reason, when the HARQ-ACK/NACK is        transmitted on the xPUSCH, the number of HARQ process IDs to be        stored by the base station may increase and the HARQ round trip        time may increase, due to the decoding latency. Therefore, the        HARQ ACK/NACK information may be transmitted through the xPUCCH        to solve the above problem. In this case, the UCI or data are        not transmitted through the xPUSCH.    -   Option 2) The terminal transmits the UCI through both of the        xPUCCH and the xPUSCH in the same subframe    -   Option 2-1) When the UCI is transmitted only on the xPUCCH: The        combinations of all the UCIs are transmitted only on the xPUCCH        and data are transmitted on the xPUSCH.    -   Option 2-2) Like the Option 1-2, the specific UCI is transmitted        only on the xPUCCH (for example, HARQ-ACK/NACK) and the xPUSCH        may be used only for the data transmission or multiplex data        with the specific UCI and transmit the multiplexed data and        specific UCI.

Meanwhile, the terminal may perform a transmission power control whentransmitting the xPUCCH or the xPUSCH. When the xPUCCH and the xPUSCHcan be transmitted in the same subframe (Option 2-1, Option 2-2), sincethe frequency resource sizes of the xPUCCH and the xPUSCH transmitted bythe terminal may be different from each other or QoSs (e.g., block errorrate (BLER), spectral efficiency, etc.) of the xPUCCH and the xPUSCH maybe different, the xPUCCH and the xPUSCH may use different transmissionpower. If the transmission power difference between the xPUSCH and thexPUCCH is large, a problem may arise in the setting of the transmissionpower of the xPUCCH immediately following the transmission power settingfor the xPUSCH transmission. Therefore, when the terminal uses thexPUCCH and the xPUSCH in the same subframe, the terminal operation forthe next transmission power control may be considered.

-   -   Option 1) xPUSCH and xPUCCH use the same transmission power: The        xPUSCH and the xPUCCH use the same transmission power. In this        case, the transmission power may be set to be the minimum value        of the xPUSCH and the xPUCCH or the maximum value of the xPUSCH        and the xPUCCH. When the transmission power is set to be the        minimum value, there is an advantage that interference caused by        adjacent cells may be reduced and the power consumption of the        terminal may be reduced. Alternatively, when the transmission        power is set to be the maximum value, the coverage of the uplink        channels (xPUSCH and xPUCCH) may be increased. The setting        values are appointed values between the base station and the        terminal. The base station broadcasts, as the system        information, the setting values to all the terminals present in        the cell of the base station through a system information block        (SIB) or may be semi-statically changed in an RRC connection        setup or and RRC Connection reconfiguration. Further, the base        station may perform a closed-loop transmission power control        through the DCI, and therefore may dynamically notify the        terminal of the information through the DCI.    -   Option 2) The xPUSCH and the xPUCCH use different transmission        power: If the xPUSCH and the xPUCCH are transmitted in the same        subframe and the xPUSCH and the xPUCCH are to be transmitted        using different transmission power, after a gain value of an        analog device for controlling the transmission power of the        xPUCCH is adjusted, a gain value of an analog device for the        transmission power control of the xPUCCH should be controlled.        To this end, since it takes sufficient time to adjust the gain        value of the analog device for the transmission power control of        the xPUCCH after adjusting the gain value of the analog device        for controlling the xPUSCH transmission power, when the xPUSCH        and the xPUCCH should be simultaneously transmitted, the        corresponding symbol may be used as a guard time without        transmitting data to the last symbol of the xPUSCH. At this        time, the base station may notify the guard time through the        DCI.

For example, the base station may specify, in the DCI, the start and endpoints of symbols used by the xPUSCH and the number of symbols used bythe xPUSCH. Under the assumption, if it is necessary to use the guardtime for the xPUCCH transmission, the base station may reduce the numberof symbols used for the xPUSCH transmission through the DCI andexplicitly notify it. (For example, when the number of symbols used forthe xPUSCH transmission in one subframe is 11, the number of symbolsused for the xPUSCH transmission is set to be 10 for the purpose of theguard Time for the xPUCCH transmission, which may be notified to theterminal through the DCI).

In another example of the setting of the guard time, when the xPUSCH andthe xPUCCH are to be transmitted in the same subframe, the terminalpunctures the last xPUSCH symbol, uses it as the guard time, andtransmits the xPUCCH.

Meanwhile, when the terminal transmits the UCI on the xPUCCH in aspecific subframe, the terminal may configure the xPUCCH according tothe type of UCIs as follows.

-   -   xPUCCH format 1: Used for scheduling request (SR) transmission.    -   xPUCCH format 1a: Used for 1-bit HARQ ACK/NACK transmission.    -   xPUCCH format 1b: Used for 2-bit HARQ ACK/NACK transmission.    -   xPUCCH format 2: Used for transmission of SR, HARQ ACK/NACK,        CQI/PMI, RI, and beam related information (BI, BQI) and there        may be various combinations. In addition, when the terminal        transmits a plurality of uplink control information through        xPUCCH 2, it may combine the HARQ ACK/NACK, SR, CQI/PMI, RI,        beam related information (BI, BQI), and BRRS information in        order to transmit the UCI. For example, the HARQ ACK/NACK, the        CQI/PMI, and the RI may be multiplexed and transmitted. As        another example, the HARQ ACK/NACK and the CQI/PMI may be        multiplexed and transmitted, or the HARQ ACK/NACK and the RI may        be multiplexed and transmitted. As another example, the HARQ        ACK/NACK, the BI, and the BQI may be multiplexed and        transmitted. As another example, the 1-bit explicit SR        information may be transmitted by being multiplexed with the        previous information (i.e., HARQ ACK/NACK+CQI/PMI+RI+SR or HARQ        ACK/NACK+BI+BQI+SR). As another example, the HARQ ACK/NACK and        the 1-bit explicit SR information may be multiplexed and        transmitted. In this manner, when the terminal simultaneously        transmits a plurality of control information through the xPUCCH,        it may transmit various combinations of control information as        described above.    -   The HARQ ACK/NACK information may be transmitted in the xPUCCH        format 1a/1b and the xPUCCH format 2. Through which xPUCCH        format the HARQ ACK/NACK feedback information transmitted by the        terminal is to be transmitted may be determined by the        following.    -   Assuming that the HARQ ACK/NACK bits=N to be fed back by the        terminal, it is obvious that if N=1, the xPUCCH format 1a is        used and if N=2, the xPUCCH format 1b is used. However, there        may be various methods for allowing the terminal to determine to        what value N is set in the xPUCCH format 2. For example, when        the HARQ ACK/NACK is transmitted like the LTE system, the N may        be determined according to whether to perform bundling or how        many the DL subframe is multiplexed. As another example, the        base station may notify the UE of an N value through RRC        signaling as long as it does not exceed the maximum HARQ process        number.

At this time, the base station may notify the terminal about whatcombination the terminal uses to perform the transmission in the xPUCCHformat 2 by using the following method.

-   -   Option 1) It can be explicitly notified through the DCI. For        example, when the possible combinations are configured as        {circle around (1)} HARQ ACK/NACK only (2-bit or more), {circle        around (2)} CQI/PMI+RI only, {circle around (3)} CQI/PMI+RI+HARQ        ACK/NACK, {circle around (4)} Beam information only, and {circle        around (5)} Beam information+HARQ ACK/NACK, it is possible to        notify whether to transmit the UCI in the xPUCCH format 2 using        any combination of the above five combinations using 3 bits in        the DCI.    -   Option 2) As another method for notifying which UCI information        will be transmitted in the xPUCCH format 2, the xPUCCH resource        index may be used. For example, the base station may notify the        terminal of the fact that {circle around (1)} HARQ ACK/NACK only        (in the case of 2-bit or more) uses xPUCCH frequency resource—1,        {circle around (2)} CQI/PMI+RI only uses xPUCCH frequency        resource—2, {circle around (3)} CQI/PMI+RI+HARQ ACK/NACK uses        xPUCCH frequency resource—3, {circle around (4)} Beam        information only uses xPUCCH frequency resource—4, {circle        around (5)} Beam information+HARQ ACK/NACK uses xPUCCH frequency        resource—5 through the UE-specific RRC signaling. The terminal        performs the transmission in the xPUCCH format 2 transmitted in        the n-th subframe using one of the above combinations. Since the        base station does not know which combination the terminal uses        to perform the transmission (for example, when the terminal does        not receive a part of the DCI), it should perform blind        searching in each of the resources.    -   Option 3) Since the base station identically allocates the        xPUCCH frequency resource for the CQI/PMI and HARQ ACK/NACK        feedback in consideration of the previous error case, i.e., the        multiplexing of the UCI but does not know the fact when not        receiving one of the grants, it may not perform the decoding.        Therefore, it is possible to explicitly include which        information is transmitted by being multiplexed with the UCI. In        the above example, if the terminal transmits ‘011’, the        combination corresponding to is transmitted. For the above        operation, the MSB or the LSB should be emptied as many as the        number (in the above example, 3 bits) of possible combinations        to transmit the multiplexed information to the UCI that the        terminal transmits.    -   Option 4) In order to reduce the signaling overhead and the        number of blind searching in the base station, a combination of        the Option 2 and the Option 3 is possible. That is, the MSB or        LSB x bits of the UCI transmitted by the terminal in the xPUCCH        format 2 represents information on which information is        transmitted (in the above example, CQI/PMI+RI={circle around        (2)} or {circle around (3)} or Beam information={circle around        (4)} or {circle around (5)}), and the base station may blindly        search whether {circle around (2)} or {circle around (3)} is        transmitted or whether {circle around (4)} or {circle around        (5)} is transmitted.

The above contents are examples for convenience of explanation, andvarious modifications may be possible based on the above description.

-   -   The combinations of UCIs transmitted in the xPUCCH format 2 may        be adjusted not to exceed [x] bits to the maximum by the base        station scheduler. If the combinations exceed the [x] bits, the        terminal may request the xPUSCH transmission to the base station        (if xPUSCH allocation is not received) or may discard some bits        or generate [x] bits according to the defined rule. That is, the        terminal may drop certain bits having low priority according to        the defined rule. At this time, the maximum [x] bits may be        referred to as a threshold bit value, and the information on a        threshold bit value may be transmitted to the terminal through        the DCI, the system information, or the RRC signaling.

For example, the defined rule may be set in order of HARQ-ACK/NACK, SRinformation, Beam related information (BI, BQI), CQI/PMI, and RI. Atthis time, it is assumed that the threshold bit value is determined tobe 22 bits. If the HARQ ACK/NACK generated by the terminal is 4 bits,when the SR is 1 bit, the beam related information is 16 bits, the RI is1 bit, and the CQI/PMI is 6 bits, the terminal may drop RI and CQI/PMIand generate the UCI using the remaining information.

-   -   As another example, if the size of the combinations of the UCIs        transmitted in the xPUCCH format 2 is greater than the [x] bits,        the terminal may request the base station to increase the number        of symbols of the xPUCCH.    -   As another example, if the size of the combinations of the UCIs        transmitted in the xPUCCH format 2 is greater than the [x] bits        and smaller than [y] bits, the terminal may request the base        station to increase the number of symbols of the xPUCCH.

The above contents are examples for convenience of explanation, andvarious modifications may be possible based on the above description.

The resource allocation method for xPUCCH format 1/1a/1b and xPUCCHformat 2 transmitted by the terminal may be considered as follows.

-   -   Option 1) All time/frequency resources may be allocated to DCI.        For example, the base station may indicate an ‘n+K’-th subframe        in which the xPUCCH is transmitted through the DL DCI in the        ‘n’-th subframe. At the same time, the base station may indicate        the frequency resource on which the xPUCCH is transmitted        through the DL DCI    -   Option 2) The time/frequency resources may be allocated through        a combination of the DCI and the RRC signaling. For example, the        base station may previously set the period of the UCI        information (e.g., SR and beam related information) to be        periodically transmitted through the RRC signaling and notify        the offset information of the subframe through the DCI. For        example, if it is assumed that the base station sets the xPUCCH        allocation period of the specific terminal is 10 ms through RRC        signaling, the terminal may expect to allocate the xPUCCH every        10 ms.

However, for various reasons (when the issue of the base stationscheduling or the beam of the terminal is changed), the base station mayoffset the xPUCCH time to be periodically allocated to change the xPUCCHtime. The time offset information is transmitted through the DCI. Atthis time, the offset information transmitted through the DCI should betransmitted to the terminal before the time when the xPUCCH is actuallyallocated periodically

-   -   Option 3) As another example of allocating time/frequency        resources through the combination of the DCI and the RRC        signaling, the base station may set a set of frequency resources        through the RRC signaling and notify, through the DCI, the        offset information of the frequency resource and a subframe        index where the xPUCCH is transmitted.

This will be described below in more detail.

FIG. 1 is a diagram illustrating a frame structure for transmittingdownlink data according to the present disclosure.

In FIG. 1, one subframe may consist of N OFDM symbols and M OFDMsubcarriers.

FIGS. 1(a) and 1(b) illustrate an example where one subframe includes adownlink control channel (xPhysical downlink control channel (xPDCCH))for downlink control information transmission and a data channel(xPhysical downlink shared channel (xPDSCH)) for downlink datainformation transmission.

K symbols before the subframe may be used for the xPDCCH transmission,and the remaining N-K OFDM symbols and M OFDM subcarriers may be usedfor the xPDSCH transmission. FIG. 1(a) illustrates an example for K=1,and FIG. 1(b) illustrates an example for K=2.

In the present disclosure, the operation of transmitting the controlinformation through the xPDCCH may be expressed as transmitting thexPDCCH, and the operation of transmitting data through the xPDSCH may beexpressed as transmitting the xPDSCH.

Meanwhile, FIGS. 1(c) and 1(d) are examples where one subframe consistsof the xPDCCH, the xPDSCH, and the uplink control channel (xPhysicalcontrol channel (xPUCCH)) for transmitting the uplink controlinformation. In this case, a guard period is required for the purpose ofa transmission/reception transition time for receiving the uplinkcontrol information from the terminal after the base station performsthe downlink data transmission between the xPDSCH and the xPUCCH.

FIGS. 1(c) and 1(d) show an example where one symbol is used as theguard period. FIGS. 1(c) and 1(d) illustrate an example where K symbolsbefore the subframe are used for the xPDCCH transmission, one symbol isused as the guard period, and one symbol is used as the xPUCCH. Theremaining N-K-2 OFDM symbols and the M OFDM subcarriers are used for thexPDSCH transmission.

FIG. 1(c) illustrates an example for K=1, and FIG. 1(d) illustrates anexample for K=2. Although not illustrated in the above drawings, inFIGS. 1(c) and 1(d), the base station may transmit a sounding referencesignal (SRS) for measuring the uplink channel state of the terminal tothe symbol position of the xPUCCH.

In FIGS. 1(a), 1(b), 1(c), and 1(d), the base station may broadcast, asthe system information, whether the number K of symbols used for thexPDCCH transmission is 1 or 2 to all terminals within a cell. That is,the base station can inform the terminal of the master information block(MIB) or the system information block (SIB) which include the number ofsymbols of the xPDCCH.

As another example, the base station may notify the terminal of thenumber of xPDCCH symbols through UE specific RRC signaling. In thiscase, when the base station drops the grant to the xPDCCH beforeestablishing the RRC connection, there is a problem in that the terminalmay not know the number of symbols of the xPDCCH. In order to preventthis, the default number of symbols is always used until RRC connectionsetup, or the number of xPDCCH symbols is specified in a message ofrandom access response RAR, and the number of xPDCCH symbol for RARgrant transmission can be fixed to 1 at all times. As another example,the base station does not transmit any information about the number ofsymbols of the xPDCCH to the terminal, and the terminal may blindlysearch for the number of xPDCCH symbols.

As another example, the base station may include bit informationindicating the number of symbols of the xPDSCH in the DCI, and thenumber of bits of the bit information may be changed. For example, itmay be indicated that if the bit information is ‘00’, N-1 symbols areused as the xPDSCH, if the bit information is ‘01’, ‘N-2’ symbols areused as the xPDSCH, and if the bit information is ‘10’, ‘N-3’ symbolsare used as the xPDSCH. The bit information may indicate the number ofsymbols of the xPDSCH of the subframe after the k-th subframe. In thiscase, the N may mean the number of symbols of the subframe after thek-th subframe.

On the other hand, when the xPUCCH exists in the corresponding subframeas illustrated in FIGS. 1(c) and 1(d), if the base station does notnotify this fact, the terminal performing only the downlink datareception does not know the number of symbols of the xPDSCH to be usedfor the downlink data reception and therefore may not perform thedecoding. In order to solve this problem, the base station can indicatethe number of symbols of the xPDSCH of the corresponding subframethrough the control information (for example, DCI) transmitted throughthe xPDCCH.

At this time, the base station may notify the number of xPUCCHs throughthe system information, the RRC signaling, or the DCI.

In addition, as shown in FIGS. 1(c) and 1(d), the xPUCCH exists in thecorresponding subframe, but the number of symbols of the xPUCCH may bechanged, but the base station may indicate the number of symbols of thexPUCCH and the symbol position of the xPUCCH through the DCI. Forexample, if there are three symbols used in the xPUCCH in a specificsubframe, the terminal A can use all three symbols for the UCItransmission to transmit the xPUCCH, and the terminal B can use only twosymbols for the UCI transmission to transmit the xPUCCH.

Therefore, the base station may indicate the terminal A that the numberof symbols used for the xPUCCH is three in the specific subframe throughthe DCI, and indicate the terminal B that the number of symbols of thexPUCCH is two. At this time, the base station can notify the terminal ofthe number of symbols of the xPUCCH using the predetermined number ofbit information.

Also, when the terminal C and the terminal D respectively use, as thexPUCCH, only one symbol for the UCI transmission by the terminals C andD, the symbol index of the xPUCCH used by the terminal C and the symbolindex of the xPUCCH used by the terminal D may be the same as ordifferent from each other.

Therefore, the base station can indicate the symbol index of the xPUCCHused by the terminal C and the symbol index of the xPUCCH used by theterminal D through the DCI. At this time, the base station can notifythe terminal of the number of symbols of the xPUCCH using thepredetermined number of bit information. However, the embodiment of thepresent disclosure is not limited thereto, and the symbol index of thexPUCCH to be used by the terminal may be set differently even if thenumber of symbols of the xPUCCH is not one, and the base station maynotify the symbol index and the number of symbols of the xPUCCH to beused by the terminal.

Also, when the number of symbols of the xPUCCH is notified through theDCI, the number of symbols of the xPDSCH may be omitted. For example,when the number of symbols of the guard period is set to be 1, theterminal may identify the number of symbols of the xPDSCH based on thenumber of symbols of the subframe, the K value obtained by the abovemethod, and the number of symbols of the xPUCCH.

However, if the number of symbols of the guard period is changed, thebase station may additionally include the information on the number ofsymbols of the guard period in the DCI, and the terminal may identifythe number of symbols of the xPDSCH using the information.Alternatively, as described above, the base station may also notify thenumber of symbols of the xPDSCH considering the number of symbols of theguard period.

However, the present disclosure is not limited thereto, and the basestation may inform the number of symbols and the symbol index of thexPUCCH, and the number of symbols of the xPDSCH through the DCI.

Also, in the case where the base station transmits the xPUCCH in aspecific subframe and the terminal-B receives the xPDSCH, the basestation may separately notify the respective terminals of the number ofsymbols. That is, the number of xPUCCH symbols may be informed to theterminal-A and the number of xPDSCH symbols may be notified to theterminal-B. FIG. 2 is a diagram illustrating a frame structure fortransmitting uplink data according to the present disclosure.

In FIG. 2, one subframe may consist of N OFDM symbols and M OFDMsubcarriers.

FIGS. 2(a) and 2(b) illustrate an example where one subframe includes adownlink control channel (xPhysical downlink control channel (xPDCCH))for uplink control information transmission and a data channel(xPhysical uplink shared channel (xPUSCH)) for uplink data informationtransmission.

K symbols before the subframe are used for the xPDCCH transmission, andthe remaining N-K OFDM symbols and the M OFDM subcarriers are used forthe xPUSCH transmission. FIG. 2(a) illustrates an example for K=1, andFIG. 2(b) illustrates an example for K=2.

In this case, a guard period is required for the purpose of atransmission/reception transition time for receiving the uplink controlinformation from the terminal after the base station performs thedownlink data transmission between the xPDSCH and the xPUCCH. FIG. 2illustrates an example where one symbol is used as the guard period.However, the number of symbols in the guard period may be changed.

Meanwhile, FIGS. 2(c) and 2(d) are examples in which one subframeconsists of xPDCCH, xPUSCH, and xPUCCH.

In FIGS. 2(c) and 2(d), K symbols before the subframe are used for thexPDCCH transmission, one symbol is used as the guard period, and onesymbol is used as the xPUCCH. The remaining N-K-2 OFDM symbols and the MOFDM subcarriers are used for the xPDSCH transmission.

FIG. 2(c) illustrates an example for K=1, and FIG. 2(d) illustrates anexample for K=2. Although not illustrated in the above drawings, inFIGS. 2(c) and 2(d), the base station may transmit the soundingreference signal (SRS) for measuring the uplink channel state of theterminal to the symbol position of the xPUCCH.

Similar to FIG. 1, in FIGS. 2(a), 2(b), 2(c), and 2(d), the base stationmay broadcast, as the system information, whether the number K ofsymbols used for the xPDCCH transmission is 1 or 2 to all terminalswithin a cell. That is, the base station may notify the terminal of thenumber of symbols of the xPDCCH by including the number of symbols ofthe xPDCCH in the MIB or the SIB.

As another example, the number of xPDCCH symbols may be notified throughUE specific RRC signaling. In this case, when the base station drops thegrant to the xPDCCH before establishing the RRC connection, there is aproblem in that the terminal may not know the number of symbols of thexPDCCH. To prevent this, the default number of symbols is always useduntil the RRC connection is established, or the number of xPDCCH symbolsis specified in the RAR message, and the number of xPDCCH symbols forthe RAR grant transmission may be always fixed to 1.

As another example, there may be a method for blindly searching for, bythe terminal, the number of xPDCCH symbols without the base stationtransmitting any information on the number of symbols of the xPDCCH tothe terminal.

On the other hand, when the xPUCCH exists in the corresponding subframeas illustrated in FIG. 2(c) and FIG. 2(d), if the base station does notnotify this fact, the terminal transmitting only the xPUSCH in thecorresponding subframe may not perform resource mapping since theterminal does not know the number of symbols of the xPUSCH to be used ofthe uplink data transmission. To solve this problem, the base stationmay indicate the number of symbols of the corresponding subframe throughthe DCI of the xPDCCH.

As another example, the base station may include bit informationindicating the number of symbols of the xPDSCH in the DCI, and thenumber of bits of the bit information may be changed. For example, itmay be indicated that if the bit information is ‘00’, N-1 symbols areused as the xPDSCH, if the bit information is ‘01’, ‘N-2’ symbols areused as the xPUSCH, and if the bit information is ‘10’, ‘N-3’ symbolsare used as the xPUSCH.

Meanwhile, as shown in FIGS. 2(c) and 2(d), the xPUCCH exists in thecorresponding subframe, but the number of symbols of the xPUCCH may bechanged, but the base station may indicate the number of symbols and thesymbol position of the xPUCCH through the DCI. For example, if there arethree symbols used in the xPUCCH in a specific subframe, the terminal Acan use all three symbols for the UCI transmission to transmit thexPUCCH, and the terminal B can use only two symbols for the UCItransmission to transmit the xPUCCH.

Therefore, the base station may indicate the terminal A that the numberof symbols used for the xPUCCH is three in the specific subframe throughthe DCI, and indicate the terminal B that the number of symbols of thexPUCCH is two. At this time, the base station can notify the terminal ofthe number of symbols of the xPUCCH using the predetermined number ofbit information.

Also, when the terminal C and the terminal D respectively use, as thexPUCCH, only one symbol for the UCI transmission by the terminals C andD, the symbol index of the xPUCCH used by the terminal C and the symbolindex of the xPUCCH used by the terminal D may be the same as ordifferent from each other.

Therefore, the base station can indicate the symbol index of the xPUCCHused by the terminal C and the symbol index of the xPUCCH used by theterminal D through the DCI. At this time, the base station can notifythe terminal of the number of symbols of the xPUCCH using thepredetermined number of bit information. However, the embodiment of thepresent disclosure is not limited thereto, and the symbol index of thexPUCCH to be used by the terminal may be set differently even if thenumber of symbols of the xPUCCH is not one, and the base station maynotify the symbol index and the number of symbols of the xPUCCH to beused by the terminal.

Also, when the number of symbols of the xPUCCH is notified through theDCI, the number of symbols of the xPUSCH may be omitted. For example,when the number of symbols of the guard period is set to be 1, theterminal may identify the number of symbols of the xPDSCH based on thenumber of symbols of the subframe, the K value obtained by the abovemethod, and the number of symbols of the xPUSCH.

However, if the number of symbols of the guard period is changed, thebase station may additionally include the information on the number ofsymbols of the guard period in the DCI, and the terminal may identifythe number of symbols of the xPUSCH using the information.Alternatively, as described above, the base station may also notify thenumber of symbols of the xPDSCH considering the number of symbols of theguard period.

However, the present disclosure is not limited thereto, and the basestation may inform the number of symbols and the symbol index of thexPUCCH, and the number of symbols of the xPUSCH through the DCI.

FIG. 3 is a diagram illustrating an uplink control channel fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The uplink control channel, the xPUCCH may be transmitted in the last Ksymbol of the subframe, as illustrated in FIGS. 1(c) and 1(d) and FIGS.2(c) and 2(d).

A plurality of users may transmit the xPUCCH in one cell. At this time,frequency division multiplexing (FDM), time division multiplexing (TDM),or code division multiplexing (CDM) in the same time-frequency resourcesmay be performed between the xPUCCHs used by users.

For example, there may be N resource block groups (RBGs) in the systembandwidth. At this time, one RBG may consist of M resource blocks (RB),and one RBG may be the resource of the xPUCCH transmitted by one user.One RB consists of 12 OFDM subcarriers (tones). Of the 12 subcarriers, Lsubcarriers may be used as a DeModulation reference signal (DMRS) usedfor xPUCCH channel estimation of the base station. Thus, 12-L OFDMsubcarriers may be used for the UCI transmission

More specifically, referring to the drawings of the present disclosure,a subcarrier on which the DMRS is transmitted may be locatedsymmetrically with respect to the center of the RB, and may be set to bespaced up and down from the center of the RB by two subcarriers. Whenthe xPUCCH is set as described above, frequency selectivity may beincreased.

FIG. 4 is a diagram illustrating an operation of a base station fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The base station may measure the uplink channel quality in step S405.The base station may measure the uplink channel quality of the terminalby measuring the sounding reference signal (SRS) or the DMRS of theuplink xPUCCH or xPUSCH that the terminal transmits on the uplink. Basedon this, the base station may adjust the number of symbols of the xPUCCHto be transmitted subsequently, and determine whether to transmit theUCI on the xPUCCH or the xPUSCH.

The base station may determine based on various methods or conditionswhether the base station instructs the terminal to transmit the UCI onthe xPUCCH or the terminal to transmit the UCI on the xPUSCH. Thedetails will be described below.

Therefore, the base station may identify whether or not a specificcondition is satisfied in step S410. In this case, the details will bedescribed below.

If the specific conditions are not satisfied, the base station mayindicate the transmission of the UCI on the xPUSCH in step S420.

On the other hand, if the specific conditions are not satisfied, thebase station may indicate the transmission of the UCI on the xPUSCH instep S430.

For example, the base station may determine whether the coverage for theuplink control information transmission is sufficient (condition 1). Thebase station may indicate the terminal to transmit the UCI on the xPUSCHif it is determined that the coverage of the uplink control informationtransmission is insufficient because the uplink channel quality of theterminal is poor as a result of the uplink channel quality measurement.

As another example, the base station may determine whether the amount ofUCI to be fed back by the terminal is smaller than a certain number ofbits (condition 2). When the amount of UCI to be fed back by theterminal is equal to or greater than a specific number of bits (forexample, when the bit size of the UCI is defined as A, A>[x] bits), thebase station may instruct the transmission of the UCI on the xPUSCH.

As another example, the base station may determine whether the specificterminal does not have data to be transmitted on the uplink (condition3). When the specific terminal needs to feed back the UCI informationwhile having data to be transmitted on the uplink, the uplink data andthe UCI are multiplexed and transmitted on the xPUSCH to efficiently usethe uplink resource.

In addition, the base station may determine to transmit the UCI on thexPUS CH by combinations of two or more of the above-mentioned conditions(condition 1, condition 2, and condition 3).

FIG. 5 is a diagram illustrating another operation of a base station fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The base station may change the number of symbols of the xPUCCHaccording to the amount of UCI to be fed back by the terminal. That is,if the amount of UCI to be fed back by the terminal exceeds the firstthreshold, the base station may increase the number of symbols in thexPUCCH. If the amount of UCI to be fed back by the terminal exceeds thesecond threshold, the terminal can be set to transmit the UCI throughthe xPUSCH. The details are as follows.

The base station may measure the uplink channel quality in step S505.The base station may measure the uplink channel quality of the terminalby measuring the sounding reference signal (SRS) or the DMRS of theuplink xPUCCH or xPUSCH that the terminal transmits on the uplink. Thebase station may adjust the number of symbols of the xPUCCH that theterminal transmits subsequently.

The base station may determine whether the condition 1 is satisfied instep S510. In this case, the condition 1 may include a case in which theamount of UCI to be fed back by the terminal is smaller than or equal tothe first threshold value ([x] bits) (A [X] bits).

If the condition 1 is satisfied, the base station may indicate thetransmission of the UCI on xPUCCH in step S520. In this case, the xPUCCHmay consist of a minimum resource or a minimum symbol. For example, ifthe amount of UCI is smaller than or equal to [x] bits, as the number ofsymbols of the xPUCCH for transmitting the UCI, one symbol may be used.

On the other hand, if the condition 1 is not satisfied, the base stationcan determine whether the condition 2 is satisfied in step S530. In thiscase, the condition 2 may include a case in which the amount of UCI tobe fed back by the terminal is smaller than or equal to the secondthreshold value ([y] bits, in this case, y>x).

If the condition 2 is satisfied, the base station may indicate thetransmission of the UCI on xPUCCH in step S540. At this time, the basestation may increase the number of symbols of the xPUCCH.

For example, if the amount of UCI to be fed back by the terminal isequal to or greater than the first threshold value (A≥[X] bits) andequal to or smaller than the second threshold value (A≤[y] bits), thebase station may increase the number of symbols of the xPUCCH for theUCI transmission to two. As described above, the base station maynotify, through the DCI, whether the number of symbols of the xPUCCH isone or two.

If the condition 2 is not satisfied, the base station may indicate theUCI transmission through the xPUCCH in step S550.

For example, if the amount of UCI to be fed back by the terminal isgreater than the second threshold value ([y] bits) (A>[y] bits, in thiscase, y>x), the base station may indicate the terminal to transmit theUCI on the xPUSCH.

The present example describes that the number of symbols of the xPUCCHis one or two, but the number of symbols is not limited thereto. Thatis, the minimum number of symbols of the xPUCCH may exceed one, and ifthe condition 2 is satisfied, the number of symbols of the xPUCCH may beset to be greater than two.

However, the conditions may be changed. For example, the conditions maybe set for the coverage of the UCI. Therefore, the number of symbols ofthe xPUCCH can be adjusted according to the coverage (or requiredreception SINR of the xPUCCH) according to the coverage that theterminal transmits.

For example, if the coverage A of the UCI to be received from aparticular terminal is equal to or smaller than the first thresholdvalue ([x1] m) (A≤[X1] m) or if the required reception SINR B is equalto or smaller than the first threshold value [[y1] Db] (B≤[y1] Db)(condition 1), the base station may use one xPUCCH symbol to transmitthe UCI. At this time, it is obvious that the first threshold value inthe case of using the coverage and the first threshold value in the caseof using the required reception SINR may be set differently.

Under the assumption, if the coverage of the UCI is greater than [x1] m(A>[x1] m) and the required SINR is greater than [y1] dB (B>[y1] dB),the base station may determine whether the condition 2 is satisfied.

If the condition 2 is satisfied, the base station increases the numberof xPUCCH symbols for transmitting the UCI to two.

As described above, the base station may notify, through the DCI,whether the number of symbols of the xPUCCH is one or two.

The condition 2 is satisfied when the coverage of the UCI is smallerthan the second threshold value ([x2] m) ((A<[x2] m) or the requiredSINR is smaller than the second threshold value ([y2] dB) (B<[y2] [dB]).Meanwhile, if the coverage of the UCI is greater than [x2] m or therequired SINR is greater than [y2] dB (in this case, x2>x1, y2>y1), thebase station may indicate the terminal to transmit the UCI on thexPUSCH.

The present example describes that the number of symbols of the xPUCCHis one or two, but the number of symbols is not limited thereto.

FIG. 6 is a diagram illustrating another operation of a base station fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The base station can transmit the DCI to the terminal. At this time, thebase station may determine whether to transmit the UL DCI or the DL DCIto the terminal.

Specifically, the base station may identify whether the condition 1 issatisfied in step S610.

If the condition 1 is satisfied, the base station may transmit the DLDCI in step S620. That is, the base station may perform triggering toallow the terminals satisfying the condition 1 to instruct thetransmission of the UCI on the xPUCCH by the DL DCI. The information ontime/frequency resources for transmitting the UCI on the xPUCCH may beincluded in the DL DCI.

At this time, the time resource information may include at least one ofa symbol index (or the number of symbols), a slot index, or a subframeindex of the xPUCCH on which the UCI is to be transmitted. Also, thefrequency resource information may include the RB position and thenumber of RBs of the xPUCCH on which the UCI is to be transmitted.

The base station scheduler may determine whether the condition 1 issatisfied in consideration of the uplink channel state of the terminalfeeding back the UCI information on the uplink, a payload size of theUCI information, or the like. That is, the base station may measure theuplink channel quality of the terminal by measuring the soundingreference signal (SRS) transmitted on the uplink or the DMRS of theuplink xPUCCH or the xPUSCH to determine the uplink channel state, andcompare the UCI coverage with the threshold value to determine whetherthe condition 1 is satisfied. Alternatively, the base station maydetermine whether the condition 1 is satisfied using whether therequested SINR is greater than the first threshold value or whether theUCI payload size is greater than the first threshold value. For example,in the present disclosure, the condition 1 is satisfied when the UCIcoverage, the required SINR, or the UCI payload size is smaller than thefirst threshold value. At this time, it is obvious that the firstthreshold value may be set differently for the UCI coverage, therequired SINR, or the UCI payload size, respectively.

On the other hand, if the condition 1 is not satisfied, the base stationmay transmit the UL DCI in step S630. In this case, the base station mayperform triggering to allow the terminals to instruct the transmissionof the UCI on the xPUSCH by the UL DCI. The information on thetime/frequency resources for transmitting the UCI or data on the xPUSCHmay be included in the UL DCI.

In this case, when the base station performs triggering to allow theterminal to transmit the UCI through the xPUSCH of the n-th subframe,the base station may additionally indicate whether the UCI should bemultiplexed with data to be transmitted on the xPUSCH or only the UCIshould be transmitted on the xPUSCH without data. At this time, the basestation may determine whether to multiplex data with the UCI based onthe 1-bit indication of the DCI.

Specifically, the base station may determine whether the condition 2 issatisfied in step S640.

If the condition 2 is satisfied, the base station may indicate themultiplexing of data with the UCI and transmitting the multiplexed dataand UCI on the xPUSCH in step S650.

On the other hand, if the condition 2 is not satisfied, the base stationmay indicate the transmission of only the UCI on the xPUSCH without datain step S660.

At this time, the condition 2 may be the same as described above. Thatis, the base station may determine whether the condition 2 is satisfiedby comparing the UCI coverage, the required SINR, or the UCI payloadsize with the second threshold value.

For example, in the present disclosure, the condition 2 is satisfiedwhen the UCI coverage, the required SINR, or the UCI payload size issmaller than the second threshold value.

At this time, it is obvious that the first threshold value may be setdifferently for the UCI coverage, the required SINR, or the UCI payloadsize, respectively.

For example, the terminal receives the DCI from the base station. Theterminal receiving the DCI demodulates and decodes the DCI, anddetermines whether it is the UL DCI or the DL DCI based on the DCIformat or the DCI Field. The detailed content is the same as above andtherefore will be omitted below.

The terminal determining that it is the UL DCI determines whether or notinformation related to the UCI transmission (hereinafter, referred to asUCI transmission information) is included in the corresponding DCI. Inthis case, the UCI transmission information may include a time/frequencyresource of an uplink data channel (xPUSCH) for transmitting the UCI. Atthis time, the time resource information of the xPUSCH may be the symbolindex (Index) (or the number of symbols), the slot index, or thesubframe index of the xPUSCH on which the UCI is to be transmitted.

On the other hand, the frequency resource information of the xPUSCH mayinclude a location of the resource block (RB) and the number of RBs ofthe xPUSCH on which the UCI is to be transmitted.

If the DCI field includes the UCI transmission information, the terminaldetermines whether there is a 1-bit indication field indicating whetherto transmit only UCI information without transmitting data or tomultiplex the UCI with data information. If the terminal is indicated totransmit only the UCI information without transmitting data to the DCIField, the terminal transmits only the UCI information on the xPUSCH.For example, when the 1-bit information is 1, it is indicated totransmit only the UCI information without transmitting data, and when itis 0, if it is assumed that it is indicated that data and the UCIinformation are multiplexed and transmitted, in the case in which the1-bit indication is set to be 1, the terminal can transmit only the UCIinformation.

On the other hand, when the 1-bit information of the DCI field is set tobe 0, the terminal multiplexes the UCI with data and transmits themultiplexed UCI and data on the xPUSCH. When the UCI is transmitted bybeing multiplexed with data, frequency resource information fortransmitting the UCI in the UCI transmission information may be omitted.This is because the frequency resource information for the datatransmission is the same as the frequency resource information for theUCI transmission.

FIG. 7 is a diagram illustrating an operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The terminal can receive the DCI transmitted by the base station in stepS710 and decode the received DCI.

The terminal may determine whether the corresponding DCI is the DL DCIor the UL DCI in step S720, and determine whether the corresponding DCIis the UL DCI in step S730.

At this time, the terminal may determine whether the corresponding DCIis the DL DCI or the UL DCI based on the DCI format promised between thebase station and the terminal or a specific field within the DCI.

For example, if the DCI is identified in the DCI format, the basestation and the terminal need to be promised in advance that A bits arethe DC DCI (DCI Format A) and B bits are the UL DCI (DCI Format B).

Otherwise, if the DCI is identified based on a specific field in theDCI, y bits constituting the MSB of the DCI Field consisting of x bitsand y bits constituting the least significant bit of the DCI Field mayindicate the DL DCI or the UL DCI. The size of y in the y bits describedabove may be different depending on the type of DCI supported by thesystem. For example, if the specific system supports four types of DCIs,then y=2, if it is ‘00’, then it may mean UL DCI for single layertransmission of the xPUSCH, and if it is ‘01’, it may mean UL DCI formulti-layer transmission of the xPUSCH. In addition, if it is ‘10’, itmay also mean DL DCI for single layer transmission of the xPDSCH and ifit is ‘10’, it may mean DL DCI for multi-layer transmission of thexPDSCH.

If the corresponding DCI is the DL DCI, the terminal may transmit theUCI on the xPUCCH in step S740.

If the corresponding DCI is the DL DCI, the terminal may transmit theUCI on the xPUSCH. At this time, the terminal can identify whether theUCI should be multiplexed with data and transmitted in step S750.

The terminal may additionally identify the 1-bit indication field of theUL DCI to identify this.

When the 1 bit information indicates the multiplexing of data with theUCI and the transmission of the multiplexed data and UCI, the terminalmay multiplex the UCI with data and transmit the multiplexed UCI anddata on the xPUSCH in step S760.

On the other hand, when the 1-bit information indicates the transmissionof the UCI without the data, the terminal may transmit only the UCI onthe xPDSCH in step S770.

FIG. 8 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The terminal can receive the DCI transmitted by the base station in stepS810 and decode the received DCI in step S810.

The terminal may determine whether the corresponding DCI is the DL DCIor the UL DCI in step S820, and determine whether the corresponding DCIis the UL DCI in step S830. This determination may be made based on theDCI format promised between the base station and the terminal, or may bemade based on the specific field in the DCI as described above, and thedetailed description thereof will be omitted.

If the corresponding DCI is the UL DCI, the terminal may transmit theUCI through the xPUSCH in step S840.

On the other hand, the terminal that has determined that the receivedDCI is a DL DCI may generate the UCI to be transmitted on the xPUCCH. Atthis time, since the xPUCCH uses less resources than the xPUSCH, thereis a need to limit the UCI payload size that can be transmitted on thexPUCCH in order to increase the reception reliability of the UCItransmitted on the xPUCCH and guarantee the transmission coverage of theUCI.

Accordingly, the terminal may identify whether the payload size of theUCI is greater than a threshold (hereinafter, [x] bits) in step S850.

If the payload size is equal to or smaller than [x] bits, the terminalmay transmit all UCI information on the xPUCCH in step S860.

On the other hand, if the payload size of the UCI is greater than [x]bits, the terminal may drop the UCI bits having low priority accordingto a rule promised between the base station and the mobile station instep S870. That is, the terminal may not transmit UCI bits having lowpriority. Priority information related to which information is not to betransmitted may be predefined by an appointment between the base stationand the terminal, and may be, for example, an order of HARQ-ACK/NACK,Beam-related information (BI, BQI), CQI/PMI, and RI.

For example, if the threshold value is 22 bits and the HARQ-ACK/NACKinformation included in the UCI is 4 bits, the beam related informationis 16 bits, the CQI/PMI is 6 bits, and the RI is 1 bit, the CQI/PMI andthe RI may be dropped according to the priority.

FIG. 9 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The terminal can receive the DCI transmitted by the base station in stepS810 and decode the received DCI in step S910.

The terminal may determine whether the corresponding DCI is the DL DCIor the UL DCI in step S920, and identify whether the corresponding DCIis the UL DCI in step S930. This determination may be made based on theDCI format promised between the base station and the terminal, or may bemade based on the specific field in the DCI as described above, and thedetailed description thereof will be omitted.

If the corresponding DCI is the UL DCI, the terminal may transmit theUCI through the xPUSCH in step S940.

On the other hand, the terminal that has determined that the receivedDCI is a DL DCI may generate the UCI to be transmitted on the xPUCCH. Atthis time, since the xPUCCH uses less resources than the xPUSCH, whenthe UCI payload size exceeds the threshold value in order to increasethe reception reliability of the UCI transmitted on the xPUCCH andguarantee the transmission coverage of the UCI, there is a need toincrease the number of symbols of the xPUCCH.

Accordingly, the terminal may identify whether the payload size of theUCI is greater than a threshold (hereinafter, [x] bits) in step S950.

If the payload size of the UCI is equal to or smaller than [x] bits, theterminal may transmit all UCI information on the xPUCCH in step S960.

Differently from FIG. 8, when the payload size of the UCI generated bythe terminal is greater than [x] bits, the terminal does not drop someUCI bits, but may transmit, to the base station, the informationindicating that the UCI bits to be transmitted by the terminal are themaximum value ([x] bits). That is, in step S970, the terminal maytransmit, to the base station, the information indicating that the UCIpayload size exceeds the threshold value.

Accordingly, the base station receiving the same may allocate, to theterminal, additional xPUCCH time/frequency resources for transmission ofthe UCI bits exceeding the maximum value.

In another example, the base station receiving, from the terminal, theinformation indicating that the UCI bits exceed the maximum value ([x]bits) may instruct the terminal to transmit the UCI on the xPUSCHinstead of the xPUCCH.

Meanwhile, the information that the terminal notifies the base station,that is, (the information indicating that the UCI size is equal to orgreater than [x] bits) may be transmitted to a scheduling request (SR)or an RACH resource using a separate sequence or may be transmittedthrough an MAC control element (MAC CE) and an MAC payload.

Meanwhile, as described above, the UCI may include one or at least twoof the scheduling request (SR), the HARQ-ACK/NACK, the rank indicator(RI), the channel quality information (CQI), the pre-coder matrixindicator (PMI), or the beam-related information (beam index and thereceived signal strength of the corresponding beam).

Also, in this example, the DL DCI may include the time/frequencyresources for the xPUCCH transmission. More specifically, the terminaldetects a specific DCI format, determines that the corresponding DCI isa DL DCI by referring to a specific field in the DCI, and obtains thetime/frequency resource information of the xPUCCH. At this time, thetime resource information of the xPUCCH may be the symbol index (Index)(or the number of symbols), the slot index, or the subframe index of thexPUCCH on which the UCI is to be transmitted. The frequency resourceinformation of the xPUCCH may include the location of the resource block(RB) and the number of RBs of the xPUCCH on which the UCI is to betransmitted.

Also, in this example, the UL DCI may include the time/frequencyresources for the xPUSCH transmission. More specifically, the terminaldetects a specific DCI format, determines that the corresponding DCI isthe UL DCI by referring to the specific field in the DCI, and obtainsthe time/frequency resource information of the xPUSCH. At this time, thetime resource information of the xPUSCH may be the symbol index (Index)(or the number of symbols), the slot index, or the subframe index of thexPUSCH on which the UCI is to be transmitted. The frequency resourceinformation of the xPUSCH may include the location of the resource block(RB) and the number of RBs of the xPUSCH on which the UCI is to betransmitted.

Meanwhile, the terminal measures a channel state information referencesignal (CSI-RS) on which the base station transmits on the downlink andreports channel state information (CSI) to the base station through theuplink. The base station may determine a transmission mode (e.g., rank 1transmission, rank 2 transmission, etc.) of the terminal using the CSIinformation reported from the terminal. Therefore, in order to supportthis operation, the base station needs to provide, to the terminal, theallocation information for the CSI-RS and the information on thetime/frequency resources for the terminal to report the CSI. Thefollowing operations may be considered for this purpose.

-   -   Option 1: The CSI-RS allocation information is transmitted        through the DL DCI, and the time/frequency resource information        for the CSI reporting may be transmitted through the UL DCI. The        terminal receiving the CSI-RS allocation information through the        DL DCI performs the measurement on the CSI-RS and performs the        CSI reporting using the time/frequency resource information        designated by the UL DCI. In this method, when the CSI-RS        measurement delay is different from the CSI reporting delay,        which is a delay between the time when the base station triggers        the CSI reporting and the time when the CSI is reported, it is        possible to provide scheduling flexibility.

However, the signaling overhead may increase because the CSI reportingprocedure is terminated when the terminal receives two different DCIs.Also, when the terminal misses one of the two DCIs, there is a problemthat confusion may occur in the operations of the base station and theterminal.

-   -   Option 2: The CSI-RS allocation information and the        time/frequency resource information for CSI reporting are        transmitted through the same DCI (DL DCI or UL DCI).

The terminal receiving the DL DCI acquires the time resource information(i.e., the symbol index, the slot index, or the subframe index) and thefrequency resource information (i.e., the location of the RB and thenumber of RBs) of the CSI-RS through the CSI-RS allocation informationand then performs the CSI-RS measurement. As described above, uponreceiving the DL DCI, when indicating the reporting of the UCI on thexPUCCH, the terminal knows that the CSI reporting should be transmittedon the xPUCCH, and acquires the time/frequency resource information forthe xPUCCH transmission in the DL DCI to report the CSI measurementinformation measured by the terminal through the xPUCCH. However, it maybe determined based on the above-described method whether report the UCIon the xPUCCH or the xPUSCH. When it is indicated that the CSI reportingis transmitted on the xPUSCH, the terminal may acquire thetime/frequency resource information for the xPUSCH transmission toreport the measured CSI measurement information through the xPUSCH.

Similarly, the terminal receiving the DL DCI acquires the time resourceinformation (i.e., the symbol index, the slot index, or the subframeindex) and the frequency resource information (i.e., the location of theRB and the number of RBs) of the CSI-RS through the CSI-RS allocationinformation and then performs the CSI-RS measurement. Upon receiving theUL DCI, when indicating the reporting of the UCI on the xPUSCH, theterminal knows that the CSI reporting should be transmitted on thexPUSCH, and acquires the time/frequency resource information for thexPUSCH transmission in the UL DCI to report the CSI measurementinformation measured by the terminal through the xPUCCH. However, it maybe determined based on the above-described method whether report the UCIon the xPUCCH or the xPUSCH. When it is indicated that the CSI reportingis transmitted on the xPUCCH, the terminal may acquire thetime/frequency resource information for the xPUCCH transmission toreport the measured CSI measurement information through the xPUCCH.

Since this method performs the CSI-RS measurement and the CSI reportingthrough a single DCI, the problem (when the signaling overhead isincreased and the terminal misses one of the two DCIs, confusion mayoccur in the operations of the base station and the terminal) of theOption 1 may be solved. However, if there is a difference between thedelay required for the CSI-RS measurement of the terminal and the CSIreporting delay, the base station scheduler may be limited inflexibility

FIG. 10 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The terminal may receive the DL DCI from the base station in step S1010.The terminal receiving the same may demodulate and decode the DCI.

The terminal demodulates the DCI in step S1020, and identifies whetherthe DCI field includes the UCI transmission information.

If the UCI transmission information is included in the DCI field, theterminal transmits UCI to the base station through the xPUCCH in stepS1030.

If the UCI transmission information is not included in the DCI field,the terminal performs the demodulation and decoding operations on thedownlink data channel in step S1040.

In this case, as described above, the UCI transmission information mayinclude the time/frequency resource of the uplink control channel(xPUSCH) for transmitting the UCI. At this time, the time resourceinformation of the xPUCCH may be the symbol index (Index) (or the numberof symbols), the slot index, or the subframe index of the xPUCCH onwhich the UCI is to be transmitted. On the other hand, the frequencyresource information of the xPUCCH may include a location of theresource block (RB) and the number of RBs of the xPUCCH on which the UCIis to be transmitted.

FIG. 11 is a diagram illustrating another operation of a terminal fortransmitting uplink control information according to an embodiment ofthe present disclosure.

The terminal receives the UL DCI from the base station. The terminalreceiving the same may demodulate and decode the DCI.

The terminal demodulates the DCI in step S1120, and identifies whetherthe DCI field includes the UCI transmission information.

In this case, the UCI transmission information may include atime/frequency resource of an uplink data channel (xPUSCH) fortransmitting the UCI. At this time, the time resource information of thexPUSCH may be the symbol index (Index) (or the number of symbols), theslot index, or the subframe index of the xPUSCH on which the UCI is tobe transmitted. On the other hand, the frequency resource information ofthe xPUSCH may include a location of the resource block (RB) and thenumber of RBs of the xPUSCH on which the UCI is to be transmitted.

Alternatively, if the UCI transmission information is not included inthe UL DCI, the terminal may transmit data on the xPUSCH in step S1140.That is, the terminal may perform encoding of data to be transmitted onthe xPUSCH.

If the DCI field includes the UCI transmission information, the terminalmay identify whether or not to multiplex the UCI and the datainformation in step S1130. At this time, the terminal determines whetherthere is the 1-bit indication field indicating whether to transmit onlyUCI information without transmitting only the UCI information to theField included in the received DCI without transmitting data or tomultiplex the UCI with the data information.

If it is assumed that only the UCI information is transmitted to the DCIfield without transmitting data (for example, ‘1’=transmission of onlythe UCI information without transmitting the data, ‘0’=if it is assumedthat data and the UCI information are multiplexed, ‘1’ is indicated),the terminal transmits only the UCI information on the xPUSCH in stepS1150.

On the other hand, if ‘0’ is indicated in the DCI field, the terminalmultiplexes the UCI and data on the xPUSCH and transmits the multiplexedUCI and data in step S1160. When the UCI is transmitted by beingmultiplexed with data, frequency resource information for transmittingthe UCI in the UCI transmission information may be omitted. This isbecause the frequency resource information for the data transmission isthe same as the frequency resource information for the UCI transmission.

FIG. 12 is a diagram illustrating an operation of a terminal for a CSImeasurement report according to an embodiment of the present disclosure.

FIG. 12 shows an example in which the CSI-RS allocation information andthe time/frequency resource information for the CSI reporting aretransmitted through different DCIs.

More specifically, the CSI-RS allocation information is transmittedthrough the DL DCI, and the time/frequency resource information for theCSI reporting may be transmitted to the UL DCI.

The terminal may receive the DL DCI, and the DL DCI may include theCSI-RS allocation information. The terminal receiving the CSI-RSallocation information through the DL DCI may perform the measurement onthe CSI-RS.

Also, the terminal may receive the UL DCI at a different time (or thesame time) from the DL DCI, and the UL DCI may include the informationfor triggering the CSI reporting and the resource information for theCSI reporting. Therefore, the terminal performs the CSI report using thetime/frequency resource information indicated by the UL DCI.

In this method, when the CSI-RS measurement delay between the time tomeasure the CSI-RS and the CSI-RS reporting time is different from theCSI reporting delay, which is a delay between the time when the basestation triggers the CSI reporting and the time when the CSI isreported, it is possible to provide scheduling flexibility.

However, the signaling overhead may increase because the CSI reportingprocedure is terminated when the terminal receives two different DCIs.Also, when the terminal misses one of the two DCIs, there is a problemthat confusion may occur in the operations of the base station and theterminal.

FIG. 13 is a diagram illustrating another operation of a terminal for aCSI measurement report according to an embodiment of the presentdisclosure.

It indicates that the allocation information of the CSI-RS and thetime/frequency resource information for the CSI reporting aretransmitted through the same DCI.

More specifically, the CSI-RS allocation information and thetime/frequency resource information for CSI reporting are transmittedthrough the same DCI (DL DCI or UL DCI).

For example, when the DL DCI is received, the DL DCI may include atleast one of the CSI-RS allocation information, the information fortriggering the CSI reporting, and the resource information for the CSIreporting.

The terminal receiving the DL DCI acquires the time resource information(i.e., the symbol index, the slot index, or the subframe index) and thefrequency resource information (i.e., the location of the RB and thenumber of RBs) of the CSI-RS through the CSI-RS allocation informationand then performs the CSI-RS measurement.

Upon receiving the DL DCI, when indicating the reporting of the CSIthrough the xPUCCH, the terminal knows that the CSI reporting should betransmitted on the xPUCCH, and acquires the time/frequency resourceinformation for the xPUCCH transmission in the DL DCI to report the CSImeasurement information measured by the terminal through the xPUCCH.However, the method of indicating whether to report the CSI through thexPUCCH or the xPUSCH may vary as described above, and when the DL DCI isreceived, it is possible to instruct the reporting of the CSI throughthe xPUSCH. In this case, the terminal may report the CSI using theresource information for reporting the CSI through the xPUSCH.

Similarly, when the UL DCI is received, the UL DCI may include at leastone of the CSI-RS allocation information, the information for triggeringthe CSI reporting, and the resource information for the CSI reporting.

The terminal receiving the UL DCI acquires the time resource information(i.e., the symbol index, the slot index, or the subframe index) and thefrequency resource information (i.e., the location of the RB and thenumber of RBs) of the CSI-RS through the CSI-RS allocation informationand then performs the CSI-RS measurement.

Upon receiving the UL DCI, when indicating the reporting of the UCI onthe xPUSCH, the terminal knows that the CSI reporting should betransmitted on the xPUSCH, and acquires the time/frequency resourceinformation for the xPUSCH transmission in the UL DCI to report the CSImeasurement information measured by the terminal through the xPUCCH.However, the method of indicating whether to report the CSI through thexPUCCH or the xPUSCH may vary as described above, and when the UL DCI isreceived, it is possible to instruct the reporting of the CSI throughthe xPUCCH. In this case, the terminal may report the CSI using theresource information for reporting the CSI through the xPUCCH.

Since this method performs the CSI-RS measurement and the CSI reportingthrough a single DCI, the problem (when the signaling overhead isincreased and the terminal misses one of the two DCIs, confusion mayoccur in the operations of the base station and the terminal) of theOption 1 may be solved.

However, if there is a difference between the delay required for theCSI-RS measurement of the terminal and the CSI reporting delay, the basestation scheduler may be limited in flexibility

FIG. 14 is a diagram illustrating a structure of the terminal accordingto an embodiment of the present disclosure.

Referring to FIG. 14, the terminal may include a transceiver 1410, acontroller 1420, and a memory 1430.

The transceiver 1410 may transmit and receive a signal to and from thebase station, and may include an interface unit for it. For example, thetransceiver 1410 may receive the DCI from the base station and maytransmit the UCI or data to the base station.

The controller 1420 may control the operation of the terminal and maycontrol the terminal to perform the operations described in theembodiment. Also, the controller 1420 may include at least oneprocessor. Further, the processor may be controlled by a programincluding instructions that execute the methods described in theembodiments of the present specification. Further, the program may bestored in a storage medium, and the storage medium may include avolatile or non-volatile memory. The memory may be a medium capable ofstoring data, and the form thereof is not limited as long as it storesthe instructions.

Also, the controller 1420 may receive the DCI transmitted by the basestation and decode the received DCI. The controller 1420 may determinewhether the corresponding DCI is the DL DCI or the UL DCI, and determinewhether the corresponding DCI is the UL DCI in step S730.

The controller 1420 may determine whether the corresponding DCI is theDL DCI or the UL DCI based on the DCI format promised between the basestation and the terminal or the specific field within the DCI. Thedetailed content is the same as above and therefore will be omittedbelow.

If the corresponding DCI is the DL DCI, the controller 1420 may transmitthe UCI on the xPUCCH.

If the corresponding DCI is the UL DCI, the controller 1420 may transmitthe UCI on the xPUSCH. At this time, the controller can identify whetherthe UCI should be multiplexed with the data and transmitted.

The controller 1420 may additionally identify the 1-bit indication fieldof the UL DCI to identify this.

When the 1-bit information indicates the multiplexing of the data withthe UCI and the transmission of the multiplexed data and UCI, thecontroller 1420 may multiplex the UCI with the data and transmit themultiplexed UCI and data on the xPUSCH.

On the other hand, when the 1-bit information indicates the transmissionof the UCI without the data, the controller may transmit only the UCI onthe xPDSCH.

In addition, when the received DCI is the DL DCI, the controller 1420can identify whether the payload value of the UCI is generator than thethreshold value. The controller 1420 may transmit all the UCIs on thexPUCCH when the payload of the UCI is equal to or smaller than thethreshold value.

On the other hand, if the payload size of the UCI is greater than thethreshold value, the controller 1420 may drop the UCI bits having lowpriority according to a rule promised between the base station and theterminal. That is, the controller 1420 may not transmit UCI bits havinglow priority. Priority information related to which information is notto be transmitted may be predefined by an appointment between the basestation and the terminal, and may be, for example, an order ofHARQ-ACK/NACK, Beam-related information (BI, BQI), RI, and CQI/PMI.

Alternatively, if the payload size of the UCI is greater than thethreshold value, the controller 1420 does not drop some UCI bits but maytransmit to the base station the information indicating that the UCIbits to be transmitted by the controller 1421 exceeds the maximum value([x] bits).

The controller 1420 receives the downlink control information,identifies whether the DCI is the uplink DCI for the uplink or thedownlink DCI for the downlink, and transmits the UCI through any one ofthe uplink control channel or the uplink data channel according to theidentification result.

In addition, the controller 1420 may control all the operations of theUE described in the present disclosure

The memory 1430 may store at least one of informationtransmitted/received through the transceiver. Further, the memory 1430may store at least one of the information generated by the controller1420.

FIG. 15 is a diagram illustrating a structure of the base stationaccording to an embodiment of the present disclosure.

Referring to FIG. 15, the base station may include a transceiver 1510, acontroller 1520, and a memory 1530.

The transceiver 1510 may transmit and receive a signal to and from theterminal, and may include an interface unit for it. For example, thetransceiver 1510 may transmit the DCI to the terminal and may receivethe UCI from the terminal.

The controller 1520 may control the operation of the base station andmay control the base station to perform the operations described in theembodiment. Also, the controller 1520 may include at least oneprocessor. Further, the processor may be controlled by a programincluding instructions that execute the methods described in theembodiments of the present specification. Further, the program may bestored in a storage medium, and the storage medium may include avolatile or non-volatile memory. The memory may be a medium capable ofstoring data, and the form thereof is not limited as long as it storesthe instructions.

The controller 1520 may transmit the DCI to the terminal. At this time,the base station may determine whether to transmit the UL DCI or the DLDCI to the terminal.

Specifically, the controller 1520 may identify whether the condition 1is satisfied. At this time, the condition 1 is the same as describedabove, and is omitted in the following.

If the condition 1 is satisfied, the controller 1520 may transmit the DLDCI. That is, the controller 1520 may perform triggering to allow theterminals satisfying the condition 1 to instruct the transmission of theUCI on the xPUCCH by the DL DCI. The information on time/frequencyresources for transmitting the UCI on the xPUCCH may be included in theDL DCI.

At this time, the time resource information may include at least one ofa symbol index (or the number of symbols), a slot index, or a subframeindex of the xPUCCH on which the UCI is to be transmitted. Also, thefrequency resource information may include the RB position and thenumber of RBs of the xPUCCH on which the UCI is to be transmitted.

The base station scheduler may determine whether the condition 1 issatisfied in consideration of the uplink channel state of the terminalfeeding back the UCI information on the uplink, a payload size of theUCI information, or the like.

On the other hand, if the condition 1 is not satisfied, the controller1520 may transmit the UL DCI. In this case, the base station may performtriggering to allow the terminals to instruct the transmission of theUCI on the xPUSCH by the UL DCI. The information on the time/frequencyresources for transmitting the UCI or the data on the xPUSCH may beincluded in the UL DCI.

In this case, when the controller 1520 performs triggering to allow theterminal to transmit the UCI through the xPUSCH of the n-th subframe,the controller 1520 may additionally indicate whether the UCI should bemultiplexed with the data to be transmitted on the xPUSCH or only theUCI should be transmitted on the xPUSCH without data. At this time, thecontroller 1520 may determine whether to multiplex the data with the UCIbased on the 1-bit indication of the DCI.

Specifically, the controller 1520 may identify whether the condition 2is satisfied. At this time, the condition 2 is the same as describedabove, and is omitted in the following.

If the condition 2 is satisfied, the controller 1520 may indicate themultiplexing of the data with the UCI and the transmission of themultiplexed data and UCI on the xPUSCH. On the other hand, if thecondition 2 is not satisfied, the controller 1520 may indicatetransmitting only the UCI on the xPUSCH without data.

In addition, the controller 1520 may generate the DCI, transmits the DCIto the terminal, and receive the UCI through any one of the uplinkcontrol channel and the uplink data channel according to whether the DCIis the uplink DCI for the uplink or the downlink DCI for the downlink.

In addition, the controller 1520 may control all the operations of thebase station described in the present disclosure

The memory 1530 may store at least one of information transmitted andreceived through the transceiver. Further, the memory 1530 may store atleast one of the information generated by the controller 1520.

Meanwhile, although the embodiments of the present disclosure have beenillustrated in the present specification and the accompanying drawingsand specific terms have been used, they are used in a general meaning inorder to assist in the understanding the present disclosure and do notlimit the scope of the present disclosure. It is obvious to thoseskilled in the art to which the present disclosure pertains that variousmodifications may be made without departing from the scope of thepresent disclosure, in addition to the embodiments disclosed herein.

The invention claimed is:
 1. A method performed by a terminal in awireless communication system, the method comprising: receiving, from abase station, configuration information including information indicatinga number of consecutive symbols of a control channel; receiving, fromthe base station based on the number of consecutive symbols of thecontrol channel, downlink control information (DCI) indicating a channelstate information (CSI) report configuration among a plurality of CSIreport configurations, the plurality of CSI report configurations beingconfigured based on radio resource control (RRC) signaling; andtransmitting, to the base station, a CSI report based on the CSI reportconfiguration.
 2. The method of claim 1, wherein the DCI furtherindicates a CSI-reference signal (CSI-RS) resource configuration, andwherein the transmitting of the CSI report comprises: receiving, fromthe base station, a CSI-RS based on the CSI-RS resource configuration,generating the CSI report based on the CSI-RS, and transmitting, to thebase station, the CSI report.
 3. The method of claim 1, wherein aCSI-reference signal (CSI-RS) resource configuration includes a timeresource allocation and a frequency resource allocation, wherein the CSIreport configuration includes a time resource allocation and a frequencyresource allocation, wherein the CSI report includes at least one of aprecoding matrix indicator (PMI), a rank indicator (RI), or a channelquality indicator (CQI), and wherein the CSI report is transmitted on aphysical uplink shared channel (PUSCH).
 4. The method of claim 1,wherein the number of consecutive symbols of the control channel isreceived through a master information block (MIB) or the RRC signaling.5. A method performed by a base station in a communication system, themethod comprising: transmitting, to a terminal, configurationinformation including information indicating a number of consecutivesymbols of a control channel; transmitting, to the terminal based on thenumber of consecutive symbols of the control channel, downlink controlinformation (DCI) indicating a channel state information (CSI) reportconfiguration among a plurality of CSI report configurations, theplurality of CSI report configurations being configured based on radioresource control (RRC) signaling; and receiving, from the terminal, aCSI report based on the CSI report configuration.
 6. The method of claim5, wherein the DCI further indicates a CSI-reference signal (CSI-RS)resource configuration, and wherein the receiving of the CSI reportcomprises: transmitting, to the terminal, a CSI-RS based on the CSI-RSresource configuration, and receiving, from the terminal, the CSI reportgenerated based on the CSI-RS.
 7. The method of claim 5, wherein aCSI-reference signal (CSI-RS) resource configuration includes a timeresource allocation and a frequency resource allocation, wherein the CSIreport configuration includes a time resource allocation and a frequencyresource allocation, wherein the CSI report includes at least one of aprecoding matrix indicator (PMI), a rank indicator (RI), or a channelquality indicator (CQI), and wherein the CSI report is received on aphysical uplink shared channel (PUSCH).
 8. The method of claim 5,wherein the number of consecutive symbols of the control channel istransmitted through a master information block (MIB) or the RRCsignaling.
 9. A terminal in a communication system, the terminalcomprising: a transceiver; and a controller coupled with the transceiverand configured to: receive, from a base station, configurationinformation including information indicating a number of consecutivesymbols of a control channel, receive, from the base station based onthe number of consecutive symbols of the control channel, downlinkcontrol information (DCI) indicating a channel state information (CSI)report configuration among a plurality of CSI report configurations, theplurality of CSI report configurations being configured based on radioresource control (RRC) signaling, and transmit, to the base station, aCSI report based on the CSI report configuration.
 10. The terminal ofclaim 9, wherein the DCI further indicates a CSI-reference signal(CSI-RS) resource configuration, and wherein the controller is furtherconfigured to: receive, from the base station, a CSI-RS based on theCSI-RS resource configuration, generate the CSI report based on theCSI-RS, and transmit, to the base station, the CSI report.
 11. Theterminal of claim 9, wherein a CSI-reference signal (CSI-RS) resourceconfiguration includes a time resource allocation and a frequencyresource allocation, wherein the CSI report configuration includes atime resource allocation and a frequency resource allocation, whereinthe CSI report includes at least one of a precoding matrix indicator(PMI), a rank indicator (RI), or a channel quality indicator (CQI), andwherein the CSI report is transmitted on a physical uplink sharedchannel (PUSCH).
 12. The terminal of claim 9, wherein the number ofconsecutive symbols of the control channel is received through a masterinformation block (MIB) or the RRC signaling.
 13. A base station in acommunication system, the base station comprising: a transceiver; and acontroller coupled with the transceiver and configured to: transmit, toa terminal, configuration information including information indicating anumber of consecutive symbols of a control channel, transmit, to theterminal based on the number of consecutive symbols of the controlchannel, downlink control information (DCI) indicating a channel stateinformation (CSI) report configuration among a plurality of CSI reportconfigurations, the plurality of CSI report configurations beingconfigured based on radio resource control (RRC) signaling, and receive,from the terminal, a CSI report based on the DCI CSI reportconfiguration.
 14. The base station of claim 13, wherein the DCI furtherindicates a CSI-reference signal (CSI-RS) resource configuration, andwherein the controller is further configured to: transmit, to theterminal, a CSI-RS based on the CSI-RS resource configuration, andreceive, from the terminal, the CSI report generated based on theCSI-RS.
 15. The base station of claim 13, wherein a CSI-reference signal(CSI-RS) resource configuration includes a time resource allocation anda frequency resource allocation, wherein the CSI report configurationincludes a time resource allocation and a frequency resource allocation,wherein the CSI report includes at least one of a precoding matrixindicator (PMI), a rank indicator (RI), or a channel quality indicator(CQI), and wherein the CSI report is received on a physical uplinkshared channel (PUSCH).
 16. The base station of claim 13, wherein thenumber of consecutive symbols of the control channel is transmittedthrough a master information block (MIB) or the RRC signaling.